 @import url(https://fonts.googleapis.com/css?family=Roboto:400,700);
 html, body {
	 width: 100%;
	 height: 100%;
	 margin: 0;
	 user-select: none;
}
 body {
	 display: flex;
	 font-family: Roboto, "Helvetica Neue", sans-serif;
	 font-size: 18px;
	 perspective: 1000px;
	 background-color: #f5f5f5;
	 flex-direction: column;
	 justify-content: center;
	 align-items: center;
}
 .description {
	 margin-top: 50px;
	 text-align: center;
	 color: #999;
	 transition: opacity 0.3s ease;
}
 .description a {
	 color: #4a9df6;
	 text-decoration: none;
}
 .btn.is-open ~ .description {
	 opacity: 0;
}
 .btn {
	 display: block;
	 position: relative;
	 width: 200px;
	 height: 80px;
	 transition: width 0.8s cubic-bezier(0.23, 1, 0.32, 1), height 0.8s cubic-bezier(0.23, 1, 0.32, 1), transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
	 transform-style: preserve-3d;
	 transform-origin: 50% 50%;
	 text-align: center;
}
 .btn-front {
	 position: absolute;
	 display: block;
	 width: 100%;
	 height: 100%;
	 line-height: 80px;
	 background-color: #f44336;
	 color: #fff;
	 cursor: pointer;
	 backface-visibility: hidden;
	 -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
	 transition: background 0.15s ease, line-height 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}
 .btn-front:hover {
	 background-color: #f77066;
}
 .btn.is-open .btn-front {
	 pointer-events: none;
	 line-height: 160px;
}
 .btn-back {
	 position: absolute;
	 width: 100%;
	 height: 100%;
	 background-color: #eee;
	 color: #222;
	 transform: translateZ(-2px) rotateX(180deg);
	 overflow: hidden;
	 transition: box-shadow 0.8s ease;
}
 .btn-back p {
	 margin-top: 27px;
	 margin-bottom: 25px;
}
 .btn-back button {
	 padding: 12px 20px;
	 width: 30%;
	 margin: 0 5px;
	 background-color: transparent;
	 border: 0;
	 border-radius: 2px;
	 font-size: 1em;
	 cursor: pointer;
	 -webkit-appearance: none;
	 -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
	 transition: background 0.15s ease;
}
 .btn-back button:focus {
	 outline: 0;
}
 .btn-back button.yes {
	 background-color: #2196f3;
	 color: #fff;
}
 .btn-back button.yes:hover {
	 background-color: #51adf6;
}
 .btn-back button.no {
	 color: #2196f3;
}
 .btn-back button.no:hover {
	 background-color: #ddd;
}
 .btn.is-open .btn-back {
	 box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}
 .btn[data-direction="left"] .btn-back, .btn[data-direction="right"] .btn-back {
	 transform: translateZ(-2px) rotateY(180deg);
}
 .btn.is-open {
	 width: 400px;
	 height: 160px;
}
 .btn[data-direction="top"].is-open {
	 transform: rotateX(180deg);
}
 .btn[data-direction="right"].is-open {
	 transform: rotateY(180deg);
}
 .btn[data-direction="bottom"].is-open {
	 transform: rotateX(-180deg);
}
 .btn[data-direction="left"].is-open {
	 transform: rotateY(-180deg);
}
